以Sm_2O_3, La_2O_3, ZrO_2和CeO_2为原料,采用固相反应法制备了(Sm_0.5La_0.5)_2(Zr_0.6Ce_0.4)_2O_7陶瓷.用X射线衍射(XRD),扫描电镜(SEM)研究了样品的相成分和微观组织,用激光脉冲法和推杆法测量了样品的热导率和热膨胀系数.结果表明,所制备的样品具有萤石晶体结构,且组织致密晶界清晰,并具有较低的热导率和满足热障涂层要求的热膨胀系数.
The (Sm_0.5La_0.5)_2(Zr_0.6Ce_0.4)_2O_7 cramic was prepared by solid reaction method using Sm_2O_3, La_2O_3, ZrO_2 and CeO_2 as raw materials. The phase composition and microstructure of the product were analyzed using X-ray diffraction (XRD) and scanning elctronical microscope (SEM), respectively. The thermal conductivity and thermal expansion coefficient were also measured using laser-flash method and pushing-rod method, respectively. XRD results show that the prepared ceramic has single fluorite structure and SEM indicate that the microstructure of the product is dense and the boundaries are very clean. The thermophysical results indicate that the thermal conductivity of the product is very low and the thermal expansion coefficient meet the basic requirement of thermal bariier coatings.
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